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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: NavigableMapKVStore.html 939 2015-05-29 01:16:17Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.kv.util;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.base.Function;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.google.common.collect.Iterators;<a name="line.11"></a>
<span class="sourceLineNo">012</span><a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.Iterator;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.Map;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.NavigableMap;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.concurrent.ConcurrentSkipListMap;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.jsimpledb.kv.AbstractKVStore;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.jsimpledb.kv.KVPair;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.jsimpledb.util.ByteUtil;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>/**<a name="line.22"></a>
<span class="sourceLineNo">023</span> * Provides a {@link org.jsimpledb.kv.KVStore} view of an underlying {@link NavigableMap NavigableMap&amp;lt;byte[], byte[]&amp;gt;}<a name="line.23"></a>
<span class="sourceLineNo">024</span> * whose keys are sorted lexicographically as unsigned bytes.<a name="line.24"></a>
<span class="sourceLineNo">025</span> */<a name="line.25"></a>
<span class="sourceLineNo">026</span>public class NavigableMapKVStore extends AbstractKVStore {<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>    private final NavigableMap&lt;byte[], byte[]&gt; map;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    /**<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * Convenience constructor. Uses an internally constructed {@link ConcurrentSkipListMap}.<a name="line.31"></a>
<span class="sourceLineNo">032</span>     *<a name="line.32"></a>
<span class="sourceLineNo">033</span>     * &lt;p&gt;<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * Equivalent to:<a name="line.34"></a>
<span class="sourceLineNo">035</span>     * &lt;blockquote&gt;&lt;code&gt;<a name="line.35"></a>
<span class="sourceLineNo">036</span>     * NavigableMapKVStore(new ConcurrentSkipListMap&amp;lt;byte[], byte[]&amp;gt;(ByteUtil.COMPARATOR)<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * &lt;/code&gt;&lt;/blockquote&gt;<a name="line.37"></a>
<span class="sourceLineNo">038</span>     *<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * @see org.jsimpledb.util.ByteUtil#COMPARATOR<a name="line.39"></a>
<span class="sourceLineNo">040</span>     */<a name="line.40"></a>
<span class="sourceLineNo">041</span>    public NavigableMapKVStore() {<a name="line.41"></a>
<span class="sourceLineNo">042</span>        this(new ConcurrentSkipListMap&lt;byte[], byte[]&gt;(ByteUtil.COMPARATOR));<a name="line.42"></a>
<span class="sourceLineNo">043</span>    }<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span>    /**<a name="line.45"></a>
<span class="sourceLineNo">046</span>     * Primary constructor.<a name="line.46"></a>
<span class="sourceLineNo">047</span>     *<a name="line.47"></a>
<span class="sourceLineNo">048</span>     * &lt;p&gt;<a name="line.48"></a>
<span class="sourceLineNo">049</span>     * The underlying map &lt;b&gt;must&lt;/b&gt; sort keys lexicographically as unsigned bytes; otherwise, behavior is undefined.<a name="line.49"></a>
<span class="sourceLineNo">050</span>     * &lt;/p&gt;<a name="line.50"></a>
<span class="sourceLineNo">051</span>     *<a name="line.51"></a>
<span class="sourceLineNo">052</span>     * &lt;p&gt;<a name="line.52"></a>
<span class="sourceLineNo">053</span>     * The underlying map's iterator &lt;b&gt;must not&lt;/b&gt; throw {@link java.util.ConcurrentModificationException}. For example,<a name="line.53"></a>
<span class="sourceLineNo">054</span>     * {@link java.util.TreeMap} does not satisfy this constraint.<a name="line.54"></a>
<span class="sourceLineNo">055</span>     * &lt;/p&gt;<a name="line.55"></a>
<span class="sourceLineNo">056</span>     *<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * @param map underlying map<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * @throws IllegalArgumentException if {@code map} is null<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * @see org.jsimpledb.util.ByteUtil#COMPARATOR<a name="line.59"></a>
<span class="sourceLineNo">060</span>     */<a name="line.60"></a>
<span class="sourceLineNo">061</span>    public NavigableMapKVStore(NavigableMap&lt;byte[], byte[]&gt; map) {<a name="line.61"></a>
<span class="sourceLineNo">062</span>        if (map == null)<a name="line.62"></a>
<span class="sourceLineNo">063</span>            throw new IllegalArgumentException("null map");<a name="line.63"></a>
<span class="sourceLineNo">064</span>        this.map = map;<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    /**<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * Get the underlying {@link NavigableMap} used by this instance.<a name="line.68"></a>
<span class="sourceLineNo">069</span>     *<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * @return the underlying map<a name="line.70"></a>
<span class="sourceLineNo">071</span>     */<a name="line.71"></a>
<span class="sourceLineNo">072</span>    public NavigableMap&lt;byte[], byte[]&gt; getNavigableMap() {<a name="line.72"></a>
<span class="sourceLineNo">073</span>        return this.map;<a name="line.73"></a>
<span class="sourceLineNo">074</span>    }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>// KVStore<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span>    @Override<a name="line.78"></a>
<span class="sourceLineNo">079</span>    public byte[] get(byte[] key) {<a name="line.79"></a>
<span class="sourceLineNo">080</span>        if (key == null)<a name="line.80"></a>
<span class="sourceLineNo">081</span>            throw new NullPointerException("null key");<a name="line.81"></a>
<span class="sourceLineNo">082</span>        return this.map.get(key);<a name="line.82"></a>
<span class="sourceLineNo">083</span>    }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>    @Override<a name="line.85"></a>
<span class="sourceLineNo">086</span>    public KVPair getAtLeast(byte[] minKey) {<a name="line.86"></a>
<span class="sourceLineNo">087</span>        final Map.Entry&lt;byte[], byte[]&gt; entry = minKey != null ? this.map.ceilingEntry(minKey) : this.map.firstEntry();<a name="line.87"></a>
<span class="sourceLineNo">088</span>        return entry != null ? new KVPair(entry) : null;<a name="line.88"></a>
<span class="sourceLineNo">089</span>    }<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>
<span class="sourceLineNo">091</span>    @Override<a name="line.91"></a>
<span class="sourceLineNo">092</span>    public KVPair getAtMost(byte[] maxKey) {<a name="line.92"></a>
<span class="sourceLineNo">093</span>        final Map.Entry&lt;byte[], byte[]&gt; entry = maxKey != null ? this.map.lowerEntry(maxKey) : this.map.lastEntry();<a name="line.93"></a>
<span class="sourceLineNo">094</span>        return entry != null ? new KVPair(entry) : null;<a name="line.94"></a>
<span class="sourceLineNo">095</span>    }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>    @Override<a name="line.97"></a>
<span class="sourceLineNo">098</span>    public Iterator&lt;KVPair&gt; getRange(byte[] minKey, byte[] maxKey, boolean reverse) {<a name="line.98"></a>
<span class="sourceLineNo">099</span>        NavigableMap&lt;byte[], byte[]&gt; rangeMap = this.map;<a name="line.99"></a>
<span class="sourceLineNo">100</span>        if (minKey != null &amp;&amp; maxKey != null)<a name="line.100"></a>
<span class="sourceLineNo">101</span>            rangeMap = rangeMap.subMap(minKey, true, maxKey, false);<a name="line.101"></a>
<span class="sourceLineNo">102</span>        else if (minKey != null)<a name="line.102"></a>
<span class="sourceLineNo">103</span>            rangeMap = rangeMap.tailMap(minKey, true);<a name="line.103"></a>
<span class="sourceLineNo">104</span>        else if (maxKey != null)<a name="line.104"></a>
<span class="sourceLineNo">105</span>            rangeMap = rangeMap.headMap(maxKey, false);<a name="line.105"></a>
<span class="sourceLineNo">106</span>        if (reverse)<a name="line.106"></a>
<span class="sourceLineNo">107</span>            rangeMap = rangeMap.descendingMap();<a name="line.107"></a>
<span class="sourceLineNo">108</span>        return Iterators.transform(rangeMap.entrySet().iterator(), new Function&lt;Map.Entry&lt;byte[], byte[]&gt;, KVPair&gt;() {<a name="line.108"></a>
<span class="sourceLineNo">109</span>            @Override<a name="line.109"></a>
<span class="sourceLineNo">110</span>            public KVPair apply(Map.Entry&lt;byte[], byte[]&gt; entry) {<a name="line.110"></a>
<span class="sourceLineNo">111</span>                return new KVPair(entry.getKey(), entry.getValue());<a name="line.111"></a>
<span class="sourceLineNo">112</span>            }<a name="line.112"></a>
<span class="sourceLineNo">113</span>        });<a name="line.113"></a>
<span class="sourceLineNo">114</span>    }<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span>    @Override<a name="line.116"></a>
<span class="sourceLineNo">117</span>    public void put(byte[] key, byte[] value) {<a name="line.117"></a>
<span class="sourceLineNo">118</span>        if (key == null)<a name="line.118"></a>
<span class="sourceLineNo">119</span>            throw new NullPointerException("null key");<a name="line.119"></a>
<span class="sourceLineNo">120</span>        if (value == null)<a name="line.120"></a>
<span class="sourceLineNo">121</span>            throw new NullPointerException("null value");<a name="line.121"></a>
<span class="sourceLineNo">122</span>        this.map.put(key, value);<a name="line.122"></a>
<span class="sourceLineNo">123</span>    }<a name="line.123"></a>
<span class="sourceLineNo">124</span><a name="line.124"></a>
<span class="sourceLineNo">125</span>    @Override<a name="line.125"></a>
<span class="sourceLineNo">126</span>    public void remove(byte[] key) {<a name="line.126"></a>
<span class="sourceLineNo">127</span>        if (key == null)<a name="line.127"></a>
<span class="sourceLineNo">128</span>            throw new NullPointerException("null key");<a name="line.128"></a>
<span class="sourceLineNo">129</span>        this.map.remove(key);<a name="line.129"></a>
<span class="sourceLineNo">130</span>    }<a name="line.130"></a>
<span class="sourceLineNo">131</span><a name="line.131"></a>
<span class="sourceLineNo">132</span>    @Override<a name="line.132"></a>
<span class="sourceLineNo">133</span>    public void removeRange(byte[] minKey, byte[] maxKey) {<a name="line.133"></a>
<span class="sourceLineNo">134</span>        if (minKey == null &amp;&amp; maxKey == null)<a name="line.134"></a>
<span class="sourceLineNo">135</span>            this.map.clear();<a name="line.135"></a>
<span class="sourceLineNo">136</span>        else if (minKey == null)<a name="line.136"></a>
<span class="sourceLineNo">137</span>            this.map.headMap(maxKey).clear();<a name="line.137"></a>
<span class="sourceLineNo">138</span>        else if (maxKey == null)<a name="line.138"></a>
<span class="sourceLineNo">139</span>            this.map.tailMap(minKey).clear();<a name="line.139"></a>
<span class="sourceLineNo">140</span>        else<a name="line.140"></a>
<span class="sourceLineNo">141</span>            this.map.subMap(minKey, maxKey).clear();<a name="line.141"></a>
<span class="sourceLineNo">142</span>    }<a name="line.142"></a>
<span class="sourceLineNo">143</span>}<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>




























































</pre>
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